Method of making binders for pigments



NITE'D" STATES HOMER A. BUCK, or OAKLAND, CALIFORNIA, ASSIGNOR 'ro GRANVILLE MOORE, 0E

PATENT- OFFICE.

SAN FRANCISCO, CALIFORNIA.

METHCD OF-MAKING BINDEBS FOR PIG'MENTS.

eanna. 3N0 Drawing.

To all whom it may concern Be it known that LHdMER A. BUCK, a.

citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented certain new and useful Improvements in Methods of Making Binders for Pigments, of which the following is a specification.

The present invention relates to the proc- 'ess of making a binder for pigments.

The primary object of the invention isto provide a process or method of making a hinder or vehicle for pigments used in the printing arts, and. relates more particularly to, use with printing inks for rotogravure printing.

It is now common practice to use inks containing volatile oils or extracts such as gasoline, benzine and the like. a

- The present invention contemplates a water ink which will entirely dispense with.

inflammable materials, and obviously this will result in a decided forward step in this It is now a common practice to run rotogravure presses in a basement, this being necessitated by the vibrationof the presses,

and basements as a rule afi'ord inadequate 'ventilation, and the pre'ssmen and employees frequently succumbfrom fumes of the in- 1 flammable matter contained in the inks.

Again the fire risk is materially reduced by the use of 'water ink, it-being a well known fact that many disastrous fires have occurred which have originated in'these press rooms because of the fact that the static electricity generated in thepress and paper have ignited the fumes of the aforesaid inflammable content of the ink.

Another benefit resulting from .the use of i a non-inflammable ink 1s the lncreased pro duction made possible by high speed rotation of the presses, which is now impossibler Under present methods the rotogravure presses are operated at approximately five thousand revolutions perghour, while with this ink the same presses have been operated safely in excess of six thousand revolutions per hour.

Havino I can state positively that a great saving has been accomplished in the use-of this ink.

-Although this binder, as hereinafter described, is applicable to various pigments, itv

has been developed-in Connection with finely reduced my invention to practice,

Specification of ietters Patent. Patented J 11116 27, 1922. Application filed Juneau, 1920. Serial No. 390,639.

' process, I- use flake shellac, borax and water,

as for example 1. 10% flake shellac.

5% powdered borax. 85% water.

2. 12.5 flakeshellac.

f 6.25% powdered borax.

81.25% water.

15. flake shellac.

7.5% powdered borax. 77.5% water.

2 It will noted that, in the three examplesgiven the proportion of shellac to powdered borax is 2 t6 1, while the amount of water may be varied. Solutions made of this 2 to 1 proportion are used from 10 to 20%, while above 20% a saturated solution of borax' is used instead of the borax powder to prevent the precipitation of borax crystals when the solution is cooled.

When the ingredients are assembled in the desired proportions they are heated' in a steamv jacketed kettle, or other suitable receptacle until a white foam appears on the .surface of the solution. This is a very important'step in the process.

The solution should be .filtered through a fine wire screen to remove foreign partlcles present in the shellac.

In order to make the ink dry more slowly and to facilitate the removal or release of the pigment from the engraved cylinder, I

provide an emulsified oil which is added to s the binder, as-lfor example:'-

-- 10% cotton seed oil. 10% powdered ac'acia.- 50% water.

Tritura'te oil'and acacia. Add 80% of the 50% water and triturate. When emulsion forms addbalance of water and again triturate.

Obviously other oils and suitable emulsifying agents may be employed.

able for use on rotogravure paper consisting of a pigment thoroughly incorporated in a non-inflammable binder.

2. A non-inflammable Water ink suitable forrotogravure high speed printing consisting of a pigment thoroughly incorporated in a non-inflammable binder contain ing emulsified oil.

3; A non-inflammable printing ink .consisting of a pigment thoroughly incorporated in a non-inflammable binder containing shellac, borax and ater.

4. A non-inflammable printing ink consisting of a pigment thoroughly incorporated in a non-inflammable binder containing shellac and borax in the proportion of l borax to 2 shellac, and water.

5. A non-inflammable printing ink consisting of a pigment thoroughly incorporated in a non-inflammable binder contain-- ing shellac and borax in the pro ortion of 1 borax to 2' shellac and emulis ed oil and Water. I

6. A step in the method of making a noninflammable binder for pigments consisting of subjecting amixture of shellac, borax and water to heat until a foam appears on the surface of the mixture.

7. The method of making a non-inflammable binder for pigments consisting of subjecting a mixture of shellac, borax and water to heat until a foam appears on the surface of the mixture, and adding emulsi- In testimony whereof I aflix my signature.

HOMER A. BUCK. 

